Pulverizing mill of the rolling mortar type



PULVERIZING MILL OF' ROLLING MORTAR TYPE Filed Aug. 4, 1947 2 Sheets-Sheet 1 Gttorneg Dec. 12, 1950 R. L. NEWCOMB ET AL 2,533,684

PULVERIZING MILL oF THE ROLLING MORTAR TYPE Filed Aug. 4, 1947 2 Sheets-Sheet 2 nveniors RICHARD L. NEWCOMB C HARLES J. HARRAH Gttorneg Patented Dec. l12, 1950 UNITED PULVERI'ZNG MILL 0F THE RGLLING MORTAR TYPE Ric-hard L. Newcomb and Charles Jefferson Harrah, Denver, C010.

Application August 4, 1947, Serial No. 765,940

3 Claims. l 1

'This invention relates to ya rock and ore lcrushing and 4grinding device and yhas for .its principal object .the provision of a simple and highly efficient grinding `device 'which will have ian exceedingly high capacity; which #can be constantly and continuously controlled to regulate the finen'ess 'of grinding; which will be economical in power' consumption; `which can be constructed in any desired size; Aand which will be long wearing 4and not affected vin "its emcienicy by wear of the lgrinding elements.

Another object of the Vinvention is to provide a 'pulveri'zi-ng mill of the rolling mortar type in which the axes of the pulverizing rollers will be positioned tangent to a circle surrounding the axis 'of the 'mill and not radial 'to the latter axis, so that the material to oe crushed and pulverized will vbe attacked upon an angle or incline `from a radial line to obtain a more `efficient pulverizing action.

A further object of the invention is to provide dragging 'elements in a mill rof this character which can vbe varied as to xangle of attack while the mill is yin operation so as to control the rate of :flow of the `material being pulveri-zed toward the `periphery of the mill.

,n :still further kobject is to provide a circular rolling pulverizing mill .of the mortar type which electric Icars traveling upon .an endless circular .peripheral track may be used for the motive power.

Gther objects and advantages `reside in the detail construction of the invention, which is designed for simplicity, economy, and efficiency. These will become more apparent from the following description.

ln the following detailed description of vthe invention, reference is had to the vaccompanying Adrawing which forms a part hereof. Like `numerals referto like parts in all views of the drawing and 'throughout the description.

In the drawing:

Fig. 1 is a lpartial plan View of the improved grinding device. The portion not illustrated is simply a repetition ofthe portion illustrated.

Fig. '2 is a vertical section taken 'along the line '2 2 of Fig. 1.

Fig. 3 is a `lfragmentary :detail section talren on the line 3 3, Fig. 2.

Fig. 4 is aside view of a power car employed *in `the improved grinding 'devlice.

Fig. `5 is an enlarged Ydetail section taken Cen the line .i5- 5, Fig. l.

'The invention comprises a circular floor I0 preferably lformed yof relatively :heavy steel yplates secured to and supported by a suitable concrete foundation i I4 VA pair of endless, spaced-apart, track rails l2 surround `the circular .oor '.I supported upon suitable track yties i3. A ,plurality of power cars are arranged to travel around :the track rails l2, upon suitable flanged track wheels i 15 fdriven "by means of electric motors IE, through suitable transmission devices as indicated at Il.

The cars I4 support the extremities of four spoke bea-Ins i8, which extend radially across the entire Vloor 'It Vat 90 intervals. The beams I8 are not .secured to the trucks, but simply rest upon supporting rollers 42 on the cars and .between two series of pushing rollers 23 -so that any eccentricity in the tracks I2 will not effect the concentricity of the wheel.

The spoke beams are secured :at 'their axial extremities between annular hub plates I9 'surrounding the axis of a center Apedestal '20. A plurality of intermediate beams, which will be herein designated as spokes 2|, extend `outward from the hub plates It between the spoke beams IB. The yspoke beams I6 and the spokes 2l are ftied 'together'at equally-spaced intervals :by means oi `tie beams .22 so that the entire assembly forms a large, flatspoked wheel supported at its periphery by the cars Ifli. The wheel is :supported at the axis by .means of supporti-ng rollers A43 which ride `around a shoulder i4 on the pedestal Z'. The wheel .is maintained lconcentric `by means of axial bearing rollers 2li which ride about an axial :bearing surface 25 on the pedestal 2El.

.A plurality :of pairs of roller links 2E are hinged- ;ly mounted yon each Vof the beams I8 and spokes 2 I. The links 2B are mounted at their upper extremities upon hinge pins 45 which extend between bearing plates 46 supported below the spoke beams |18 and spokes 2.1 by means of `angle hangers 4l.

vAplurality of .relatively .heavy crushing rollers t2? are rotatably mounted on .roller yshafts vlil extend-ing between the :extremities of the pairs of links 12'5 so as to trail behind `the 'arms and beams and roll upon the floor is. The crushing rollers 21 'are arranged :in staggered relation., ,so that every portion 'ofthe liioor It! within zthe cir-- cular paths .of the 'rollers will 'be "subjected to their crushing action. The material to be crushed is fed into a receiving hopper 28, from which it flows to the floor I8 through a plurality of discharge chutes 29.

The material being crushed is swept toward the circumference of the iloor I by means of drags 30 which trail from the cross beams I8. The drags 38 are arranged in pairs. The outer extremity of each drag of each pair is hingedly secured to one oi the roller arms 25, such as by means of chain links 3i. The inner extremities of the dragsof each pair are secured to the opposite extremities of a cable 32. The cables 32 are wound intermediate their extremities about cable drums 33 which can be reversibly rotatedl by means of motors 3@ mounted on floors 39 on the cross beams I 8. The extremities of the cables 32 are led through guide tubes 35 extending through the supporting floors 39 from the beam I8 to the drags 30.

It can be seen that if the drums 83 are rotated in one direction, they will act to pull the inner extremity of the outer drag forwardly and allow the outer extremity of the inner drag to trail rearwardly so as to incline the drags to cause them to plow the material being ground toward the periphery of the floor iii. The angle of incline of the drags can be regulated by means oi the motors 3A. In fact, the incline can be reversed so that material can be worked inwardly for re-grinding, if desired.

The ground material is gradually dragged or scraped to the circumference of the oor iQ, where it falls into an annular trough 3% surrounding the iloor. A plurality oi Scrapers 31 suspended from the beams I8 on angle hangers move around the circular trough S6, dragging the material to one or more sunken screw conveyors 38, which discharges to any suitable receiver.

The current to operate the motors I6 and 3ft is conveyed to the rotating portions of 'the crusher through the medium of suitable electrical conductors lil in a hollow center post 4E! through the medium of suitable collecting rings and brushes (not shown), such as are conventionally used in conducting Ycurrent to rotating equipment. Suitable electrical controllers are of course placed in circuit with the various motors to control their speed and direction.

It is desired to call attention to the fact that the axes of the rollers 21 are not radial. They travel parallel to the spoke members of the wheel and trail behind the latter. This arrangement is Y for the specific purpose of imparting a double action to the crushing rollers. They not only roll about the axle shafts 48, but they are also constantly moved longitudinally of their axis by the outwardly swinging movement of the rearwardly trailing roller links 26. This gives a combined rolling or crushing action and a sideward movement or abrading action which greatly increases the speed and eiciency of the grinding and crushing eiect.

The bearing plates d bear against the sides of the links 25 and prevent them from swinging sideward. This forces the crushing rollers to move sidewardly as they rotate.

The floor I il can be made in any desired diameter. A diameter of 40 feet has been found to be practical where large capacities are required. While the steel illustrated has eight spoke members, it is to be understood that this is simply illustrative. It could have either more or less, depending upon the capacity desired.

The hopper 28 is supported on legs 5U from the upper hub plate I9 and is formed integrally with a central bearing sleeve 5I which is rotatably mounted about the center post 4I). Thus, the hopper rotates with the grinder. On the cars I4 the power is transmitted from the transmission device II independently to the wheels by means of suitable belts 52 riding over belt pulleys 53.

While a specific form of the improvement has been described and illustrated herein, it is desired to be understood that the same may be Varied, within the scope of the appended claims, without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letters Patent is:

l. An ore grinding machine comprising: a circular, horizontal iioor; a pedestal arising at the axis of said oor; a circular track concentrically surrounding said floor; hub members rotatably mounted on said pedestal; cross beams extending from said hub members radially outward over said track; cars mounted on said track, there being one car under the projecting extremity of each cross beam; means projecting upward from each car into engagement with the cross beam thereabove to propel the latter driving motors on said cars; pairs of equal-lengthed hinged roller links extending rearwardly from each cross beam; a crushing roller mounted between each pair of roller links so as to roll upon said floor with its axis spaced from and parallel to the adjacent beam; means for feeding material to be crushed to said floor adjacent the axis thereof; means ior conveying the material being crushed toward the circumference of said floor; and means for'maintaining said links at right angles to said beams so that the axes of said rollers will be maintained at acute angles to radii extending through the rollers.

an ore grinding machine comprising: a circular, horizontal floor; a pedestal arising at the axis of said floor; a circular track concentrically surrounding said oor; hub members rotatably mounted on said pedestal; cross beams extending :from said hub members radially outward over said track; cars mounted on said track, there being one car under the projecting extremity of eac cross beam; means projecting upward from each car into engagement with the cross beam thereabove to propel the latter driving motors on said cars; two pairs of hinged roller links extending rearwardly frcm each cross beam; a pair of crushing rollers, there being a crushing roller mounted between each pair Yof roller links so as to roll upon said floor; means tor feeding material to vbe crushed to said fioor adjacent the axis thereof; an elongated drag member hingedly secured to the outer roller links of the outer roller of each pair and extending inwardly toward the axis of the floor rearwardly of said roller; an inner drag member secured to the inner roller links of the inner roller of each pair and extending outwardly toward the circumference of said floor; a cable having its extremities secured to the adjacent free extremities of said drag members; and a motor-operated reel about which the mid-portion of said cable is wrapped, so that rotation of said reel will incline both drag members simultaneously in a common direction.

3. A pulverizing mill comprising: a horizontal circular oor; a vertical pedestal at the axis of said oor; a plurality of horizontal radial arms adapted to rotate about said pedestal; a pair of crushing rollers positioned on said floor behind each arm; hinged links connecting said rollers to the adjacent arm; an elongated drag member positioned behind each roller of each pair of rollers in substantially longitudinal alignment with each other; hinge means securing the distant extremities of said drag members to the distant links of a pair of rollers; a cable extending from the adjacent extremity of one drag member to the adjacent extremity of the other drag member; and cable-reeling means mounted on the arm between said rollers, said cable passing about and being secured to said cable-reeling means intermediate the extremities of said cable so that rotation of said cable-reeling means will swing the adjacent extremities of each pair of drag members in opposite directions.

RICHARD L. NEWCOMB.

CHARLES JEFFERSON HARRAH.

REFERENCES CITED The following references are of record in the le of this patent:

Number l5 Number 6 UNITED STATES PATENTS Name Date Phelps May 27, 1879 Doolittle May 1. 1883 Wanneveich Oct. 5, 1886 Ladd Aug. 14, 1894 Lonergan Nov. 15, 1898 Lane Apr. 11, 1899 Mann Dec. 19, 1899 Wegerif Apr. 14, 1903 Goodwin Jan. 16, 1912 Lane Apr. 30, 1918 FOREIGN PATENTS Country Date Germany Nov. 8, 1940 Great Britain Aug. 12, 1899 France Aug. 6, 1824 France June 16, 1910 France May 28, 1920 France July 27, 1922 

